CN1064143C - Developing apparatus - Google Patents
Developing apparatus Download PDFInfo
- Publication number
- CN1064143C CN1064143C CN95103569.XA CN95103569A CN1064143C CN 1064143 C CN1064143 C CN 1064143C CN 95103569 A CN95103569 A CN 95103569A CN 1064143 C CN1064143 C CN 1064143C
- Authority
- CN
- China
- Prior art keywords
- magnetic
- developer
- developing apparatus
- carrier band
- developer carrier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
- G03G15/0942—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush with means for preventing toner scattering from the magnetic brush, e.g. magnetic seals
Abstract
A developing apparatus including a developer container for accommodating a developer having magnetic particles; a rotatable developer carrying member, provided in a opening of the the developer container for carrying the developer; a magnet in the developer carrying member; a magnetic member, provided at a end portion of the developer carrying member, being subjected to magnetic force of the the magnet; wherein the magnetic member is positioned with a gap relative to the developer carrying member, along a circumference of the developer carrying member; a regulating member for regulating the developer on the the developer carrying member; wherein magnetic confining force for the developer by the magnetic member is weaker toward a regulation portion of the regulating member in a circumferential direction of the developer carrying member.
Description
The present invention relates to a kind of developing apparatus, it is used for resembling developing electrostatic image on the part carrying of xerography or electrostatic recording formula image device.
Up to now, in developing apparatus, extensively adopt the seal that is positioned at the development sleeve end to prevent that developer from leaking.
In No. 5177536 disclosed encapsulating method of United States Patent (USP), seal is arranged on the axial end portion facing to development sleeve, and keeps a gap with sleeve, so that utilize magnetically confined power.
Fig. 2 shows an example of developing apparatus, and it utilizes magnetically confined power to prevent that developer is from end leakage.
Fig. 2 (a) is a positive sectional view, and Fig. 2 (b) is a side cross-sectional view.
In Fig. 2, developer reservoir of label 200 expression, 211 on the axle of magnetic roller 210 are fixed on the developer reservoir 200 by fixture 212.
Therefore, magnetic roller 210 is static with respect to developer reservoir 200.In addition, nonmagnetic substance development sleeve of label 220 expressions, it accommodates above-mentioned magnetic roller 210, and it can be rotated with respect to developer reservoir 200 by bearing 221 supportings.
As shown in Figure 2, magnetic roller 210 has magnetized 5 magnetic pole (S
1The utmost point, S
2The utmost point, N
1The utmost point, N
2The utmost point, N
3The utmost point), contain the two-component developing agent of non-magnetic toner and magnetic carrier because N
3The effect of the utmost point (the absorption utmost point) and being drawn on the outside surface of development sleeve 220.By the developer drawn along with development sleeve 220 is sent to S along the rotation of the direction of arrow R among Fig. 2
2The utmost point (carry electrode) is then at N
1Under the effect of the utmost point (the cutting utmost point) and scraper plate 230, be coated on the outside surface of development sleeve 220 with the form of thin layer, scraper plate 230 is as the regulating device of regulating developer layer thickness.The developer that applies with thin layer form makes a unshowned latent image carry formation latent image development on the part, and this latent image carries part near S
1The position on the utmost point (the development utmost point) opposite.
Non-magnetic toner is owing to the development effect consumes, and toner content descends.Such developer is sent to N
2The utmost point (the absorption utmost point) utilizes then because N
3The utmost point and N
2The repulsion function in the magnetic field that the utmost point constitutes, and make it not from N
2The utmost point is to N
3The utmost point transmits.Surpass N
2The part developer of the utmost point carrier band limit then falls under gravity in first teeter chamber 240 in the developer reservoir 200.In first teeter chamber 240, be provided with first screw rod 241.The developer that falls from development sleeve 220 and not by N
3The residue developer that the utmost point (the absorption utmost point) is drawn, under the rotation of screw rod be agitated on one side, the direction of arrow S is transmitted among an edge Fig. 2.
Be sent to the developer of 240 ends, first teeter chamber by first screw rod 241, be sent to second teeter chamber 250 by the opening that is positioned at a baffle wall 201 ends.Utilize a unshowned toner content detection device and a toner feedway, an amount of non-magnetic toner is provided, toner is along with the rotation of second screw rod 251 then, be stirred on one side, be transmitted on one side, and send back to first teeter chamber by the opening that is positioned at baffle wall 201 the other end, so that utilize its repeated developing effect.
In order to prevent that the round-robin developer from leaking, and is provided with a magnetic part 260 near development sleeve 220 axial two opposite end portions.Referring to Fig. 3 and 4, the mechanism of utilizing magnetic part 260 to prevent that developer from leaking is described.For simplicity, among Fig. 3 and Fig. 4 with Fig. 2 in have a corresponding function parts adopt the label identical with Fig. 2, so repeat no more.
Shown in the magnetic line of force among Fig. 3, when being provided with magnetic part 260, between magnetic part 260 and magnetic roller 210, produce strong magnetically confined power, make developer be constrained between magnetic part 260 and the development sleeve 220, as shown in Figure 4 along the magnetic line of force under the effect of magnetically confined power.Even development sleeve 220 rotates, developer is not also with its rotation campaign.Developer itself forms a wall by strong magnetically confined power constraint between magnetic part 260 and development sleeve 220, thereby has prevented that developer from leaking from developer reservoir 200 near development sleeve 220 axial opposed ends.
Yet when shortening the axial length of development sleeve 220 when the requirement that reduces the imaging equipment size that proposes recently for As soon as possible Promising Policy, the axial length of magnetic roller 210 also will shorten as far as possible, will cause following point like this.
Now, these problems are described referring to Fig. 5 and 6.For the sake of simplicity, among Fig. 5 and 6 with Fig. 2 in the indication of identical label have the parts of corresponding function, and these parts are not elaborated again.
As illustrated in Figures 5 and 6, when the axial length of magnetic roller 210 shortened, the position of magnetic part 260 must be near the end of magnetic roller 210.This be because, when magnetic part 260 also departs from simultaneously vertically, the axial width that then is coated in the developer in the developer thin layer on the development sleeve 220 will reduce, consequently, just can not on the whole image size of the maximum axial width of the instructions defined of the image device that uses this developing apparatus, develop.
And on the other hand, when the end of the more close magnetic roller 210 in the position of magnetic part 260 (as shown in Figure 5), the magnetic line of force of magnetic roller 210 and 260 formation of magnetic part becomes more sparse and broad, and the magnetic flux density of magnetic roller 210 ends is littler than the magnetic flux density of non-end position.In addition, the magnetic flux density of magnetic roller 210 is bigger in axial inboard, and therefore, the magnetic line of force is axially inwardly moved to state shown in Figure 5.Like this, the shape of the developer wall that forms between development sleeve 220 and magnetic part 260 just becomes appearance shown in Figure 6.
When near scraper plate, forming developer wall shown in Figure 6, to be capped the developer wall that the end of developer thin layer will far be stretched vertically on the development sleeve 220 and stop, make the axial cover width of developer on development sleeve narrow down.Therefore, just can not develop having on the whole image size of axial breadth extreme.
The purpose of this invention is to provide a kind of developing apparatus, it can provide thickness uniform developer layer on the whole development width of developer carrier spare.
Another object of the present invention provides a kind of developing apparatus of axial length shortening of developer carrier band spare.
According to an aspect of the present invention, provide a kind of developing apparatus, it comprises: one is used for the developer reservoir that splendid attire has the developer of magnetic-particle; A rotating developer carrier spare that is used for the carrier band developer, it is arranged in the opening of developer reservoir; A magnet that is arranged in developer carrier band spare; A magnetic part, it is arranged on an end of developer carrier band spare, bears the magnetic force of described magnet; Wherein, magnetic part along the periphery of developer carrier band spare, keeps a gap with respect to developer carrier spare; A regulating part that is used to regulate the developer on the developer carrier spare; Wherein, the magnetically confined power that produces by magnetic part to developer, along developer carrier spare circumferentially, regulate part and weaken towards of regulating part.
By reading, can more clearly understand above and other objects of the present invention, feature and advantage below in conjunction with the explanation of accompanying drawing to the preferred embodiments of the present invention.
Fig. 1 (a) is the orthogonal view of developing apparatus according to an embodiment of the invention.
Fig. 1 (b) is the sectional side view of Fig. 1 (a) shown device.
Fig. 2 (a) is the orthogonal view as the apparent scape device of background technology of the present invention.
Fig. 2 (b) is the sectional side view of Fig. 2 (a) shown device.
Fig. 3 and Fig. 4 have represented to prevent the measure of developer leakage.
Fig. 5 and Fig. 6 have represented task to be solved by this invention.
Fig. 7 and Fig. 8 have represented the effect of the embodiment of the invention.
Fig. 9 (a) is the orthogonal view of developing apparatus according to another embodiment of the invention.
Fig. 9 (b) is the sectional side view of Fig. 9 (a) shown device.
Figure 10 is the fragmentary cross-sectional view of the developing apparatus of further embodiment of this invention.
Below in conjunction with accompanying drawing embodiments of the invention are described.
In the accompanying drawings, have the parts of corresponding function with the indication of label identical among Fig. 2, and for the sake of simplicity, these parts are not elaborated again.
Fig. 1 shows the sectional view of developing apparatus according to an embodiment of the invention.
Axially, magnetic part 160 is positioned at the inboard of magnetic roller 210 end faces.Magnetic roller 210 produces the magnetic force that is used for the carrier band developer.The magnetic force that magnetic roller 210 produces is concentrated, and utilizes magnetically confined power and Fig. 4 to form the magnetic brush of magnetic carrier similarly, in case the developer leakage.
In addition, in this embodiment, magnetic part 160 comprises that a magnetic force weakens part 160a, and this part circumferentially has big gap apart from the surface of its adjacent development sleeve 220 along developer carrier band spare.Magnetic part 160 also comprises a scraper plate 230 that is used as the developer regulating part, and it is used to regulate the quantity of the developer on the developer carrier spare, it by resemble SUS, the such nonmagnetic metal of aluminium is made.
For the requirement of the size that satisfies the image device reduce to use this developing apparatus, the axial length of development sleeve 220 and magnetic roller 210 has shortened, therefore, and the end of the more close magnetic roller 210 in the position of magnetic part 160.
Fig. 7 and Fig. 8 show magnetic part 160 and near the magnetic line of force between the magnetic roller 210 of scraper plate 230, and the wall that is made of the developer of 220 of magnetic part 160 and development sleeves under this structure.
Among Fig. 7 and Fig. 8 with Fig. 1 in identical label indication have the parts of corresponding function, and these parts are not elaborated again for the sake of simplicity.As shown in Figure 8, by reducing magnetically confined power, make the developer wall of close scraper plate narrow down, and almost developer can not be constrained in vertically the inboard of magnetic part 160.Therefore, can guarantee to cover the axial width of the developer thin layer on the development sleeve 220, like this, just can develop the whole image domain in the image device that uses this developing apparatus with maximum axial width.
The developer blocking effect of above-mentioned developer wall self has been weakened, and is shown by long duration test, in the lifetime of developing apparatus, does not have to occur to rotate the problem that load increases because developer leaks the development sleeve 220 that causes.
Test condition is as follows:
Development sleeve diameter: 24.5mm
The rotational frequency of development sleeve: 186rpm
The magnetic roller is at the cutting utmost point magnetic flux density of magnetic part part: 360G
The magnetic roller is at the cutting utmost point half-peak width of magnetic part part: 50 °
The cutting utmost point magnetic flux density of magnetic roller part beyond magnetic part: 650G
The cutting utmost point half-peak width of magnetic roller part beyond magnetic part: 50 °
Magnetic part and development sleeve are at the gap of scraper plate contact portion: 6mm
Near magnetic part and the development sleeve gap non-scraper plate: 1.5mm
The average particle size particle size of magnetic carrier: 50 microns
The maximal magnetization of magnetic carrier: 60emu/g
Magnetic material: iron (nickel plating)
The life-span of developing apparatus: 60000 (output of A4 size video).
A lights from Fig. 1, and the gap that magnetic part 160 and development sleeve are 220 begins to widen.With respect to the circular motion direction of development sleeve 220, the A point is positioned at N
1The utmost point and S
2Magnetic flux density is the downstream of that point of zero between the utmost point.
The magnetic roller has magnetic pole N at the position of weakening part 160a facing to magnetic force
1, particularly, it is non-vanishing to weaken the magnetic flux density at position of part 160a facing to magnetic force on the magnetic roller.
Therefore, even weaken, also can reach the effect that prevents that highly developer from leaking near the magnetic force at magnetic part place.
Fig. 9 has schematically illustrated the structure of second embodiment of the invention.Among Fig. 9 with Fig. 1 in identical label represent to have the parts of corresponding function, and for simplicity, no longer these parts are elaborated.
In Fig. 9, magnet that is arranged on magnetic part 160 outsides vertically of label 900 expressions.Side facing to development sleeve 220 on the magnet 900 is magnetized into the S utmost point, and its opposite side then is magnetized into the N utmost point.Magnetic flux density component towards magnetic roller 210 centers is 200G, and curved.
Utilize this magnet to retrain to have passed developer by the minute quantity of magnetic roller 210 and magnetic part 160 formed developer walls, can make thus life-span of the developing apparatus of present embodiment extend to about 4 times to the life-span of the developing apparatus of first embodiment, and have and the first embodiment similar effects.
The long duration test condition of second embodiment is basically the same as those in the first embodiment.
The following describes the third embodiment of the present invention.
In first and second embodiment, the present invention is applied to using in the developing apparatus of the two-component developing agent that contains non-magnetic toner and magnetic carrier.But the present invention is not limited in the developing apparatus of this use two-component developing agent, and it also can be effectively used in the developing apparatus of the sort of use magnetic mono-component toner.
Yet in general, the average particle size particle size of magnetic mono-component toner is less than magnetic carrier, for example, be essentially 10 microns, therefore, in this embodiment, gap between development sleeve and magnetic part end being 2mm near the scraper plate place, is 0.5mm at other position.
Figure 10 has schematically represented the structure of critical piece among this embodiment.
In Figure 10, label 21 expression magnetic rollers, 22 expression development sleeves, 23 expression scraper plates, 16 expression magnetic parts, other structure then with shown in Figure 1 identical, no longer illustrates this.
As previously mentioned, according to the present invention, in order to satisfy the requirement reduce the imaging equipment size, shorten the axial length of magnetic roller as much as possible according to the axial length of development sleeve.Even so, also to dwindle as much as possible by the width that is used to prevent the developer wall that developer forms to the magnetic part of external leakage vertically.Therefore, just can on the whole width of the axial maximum video of image device, develop.
Though in conjunction with disclosed structure the present invention is illustrated above, the present invention is not limited in these details, and the application should comprise various modification or the modification in the scope that belongs to the object of the invention or claim.
Claims (14)
1. developing apparatus, it comprises:
One is used for the developer reservoir (200) that splendid attire has the developer of magnetic-particle;
A rotating developer carrier band spare (220) that is used for the described developer of carrier band, it is arranged in the opening of described developer reservoir (200);
A magnet (210) that is arranged in described developer carrier spare;
A magnetic part (260), it is arranged on an end of described developer carrier band spare (220), bears the magnetic force of described magnet;
It is characterized in that:
Described magnetic part (260) is with respect to described developer carrier band spare (220), and the periphery along described developer carrier band spare (220) keeps a gap;
A regulating part (230) that is used to regulate the developer on the described developer carrier band spare (220);
Wherein, the magnetically confined power that produces by described magnetic part (260) for described developer, along described developer carrier band spare (220) circumferentially, regulate part towards of described regulating part (230) and weaken.
2. according to the developing apparatus of claim 1, it is characterized in that, described magnetically confined power except basic near the described adjusting part be constant.
3. according to the developing apparatus of claim 1, it is characterized in that the described gap between described developer carrier band spare (220) and described magnetic part (260) along circumferentially, is partly widened towards the adjusting of described regulating part (230).
4. according to the developing apparatus of claim 3, it is characterized in that, described gap except basic near the described adjusting part be constant.
5. according to the developing apparatus of claim 3, it is characterized in that, one of described magnet (210) facing to being arranged near a described zone of regulating the part with part of broad gap, magnetic flux density is non-vanishing.
6. according to the developing apparatus of claim 1, it is characterized in that described magnetic part (260) is fabricated from iron.
7. according to the developing apparatus of claim 6, it is characterized in that, be coated with nickel on the described iron.
8. according to the developing apparatus of claim 1, it is characterized in that between described developer carrier band spare (220) and described magnetic part (260), the magnetic force of described magnet (210) forms a brush that can prevent the developer leakage effectively that is made of described magnetic-particle.
9. according to the developing apparatus of claim 1, it is characterized in that, also comprise one along described developer carrier band spare (220) axially and be arranged on the auxiliary sealing member (900) of survey described magnetic part outside.
10. according to the developing apparatus of claim 9, it is characterized in that described auxiliary sealing member comprises a magnetic.
11. the developing apparatus according to claim 1 is characterized in that, described magnet (210) extends axially along described developer carrier band spare (220), and described magnet (210) produces and makes the magnetic force of developer carrier band spare (210) for the described developer of development usefulness.
12. the developing apparatus according to claim 11 is characterized in that, described magnetic part (260) is along the inboard of an end that is axially disposed within described magnet (210) of described developer carrier band spare (220).
13. the developing apparatus according to claim 1 is characterized in that, described developer contains non-magnetic toner.
14. the developing apparatus according to claim 3 is characterized in that, described magnet (210) has a magnetic pole at one facing to being arranged in the described zone of regulating near the part with broad gap the part.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP055910/94 | 1994-03-25 | ||
| JP055910/1994 | 1994-03-25 | ||
| JP6055910A JP2960298B2 (en) | 1994-03-25 | 1994-03-25 | Developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1115425A CN1115425A (en) | 1996-01-24 |
| CN1064143C true CN1064143C (en) | 2001-04-04 |
Family
ID=13012277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95103569.XA Expired - Fee Related CN1064143C (en) | 1994-03-25 | 1995-03-25 | Developing apparatus |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5596392A (en) |
| EP (1) | EP0674244B1 (en) |
| JP (1) | JP2960298B2 (en) |
| KR (1) | KR0167073B1 (en) |
| CN (1) | CN1064143C (en) |
| DE (1) | DE69517230T2 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3252090B2 (en) * | 1996-07-10 | 2002-01-28 | キヤノン株式会社 | Developing device |
| US6385415B1 (en) * | 2000-05-18 | 2002-05-07 | Nexpress Solutions Llc | Development station for a reproduction apparatus |
| US8840786B2 (en) | 2007-01-09 | 2014-09-23 | Evoqua Water Technologies Llc | System and method for removing dissolved contaminants, particulate contaminants, and oil contaminants from industrial waste water |
| US20110036771A1 (en) | 2007-01-09 | 2011-02-17 | Steven Woodard | Ballasted anaerobic system and method for treating wastewater |
| US8470172B2 (en) | 2007-01-09 | 2013-06-25 | Siemens Industry, Inc. | System for enhancing a wastewater treatment process |
| CN101610850B (en) * | 2007-01-09 | 2012-07-04 | 剑桥水技术公司 | Improved collection system for a wet drum magnetic separator |
| US20100213123A1 (en) | 2007-01-09 | 2010-08-26 | Marston Peter G | Ballasted sequencing batch reactor system and method for treating wastewater |
| JP2010061064A (en) | 2008-09-08 | 2010-03-18 | Ricoh Co Ltd | Developer carrier, development device, process cartridge, and image forming apparatus |
| JP2012078548A (en) * | 2010-10-01 | 2012-04-19 | Fuji Xerox Co Ltd | Developing device and image forming apparatus |
| WO2013110727A2 (en) | 2012-01-26 | 2013-08-01 | Ineos Europe Ag | Copolymers for wire and cable applications |
| US10919792B2 (en) | 2012-06-11 | 2021-02-16 | Evoqua Water Technologies Llc | Treatment using fixed film processes and ballasted settling |
| AU2013323431B2 (en) | 2012-09-26 | 2017-10-12 | Evoqua Water Technologies Llc | System for measuring the concentration of magnetic ballast in a slurry |
| EP4006645A1 (en) * | 2018-02-02 | 2022-06-01 | Canon Kabushiki Kaisha | Method for fixing regulating blade and developing device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3982498A (en) * | 1973-11-19 | 1976-09-28 | Xerox Corporation | Development apparatus |
| JPS62143968U (en) * | 1986-03-05 | 1987-09-10 | ||
| EP0715227B1 (en) * | 1989-03-31 | 1999-12-01 | Canon Kabushiki Kaisha | A developing apparatus |
| JPH02298974A (en) * | 1989-05-12 | 1990-12-11 | Minolta Camera Co Ltd | Developing device |
| JP2892456B2 (en) * | 1989-08-04 | 1999-05-17 | キヤノン株式会社 | Developing device |
| JP2899079B2 (en) * | 1990-07-10 | 1999-06-02 | キヤノン株式会社 | Developing device |
| JPH04136965A (en) * | 1990-09-28 | 1992-05-11 | Canon Inc | Developing device |
-
1994
- 1994-03-25 JP JP6055910A patent/JP2960298B2/en not_active Expired - Fee Related
-
1995
- 1995-03-23 US US08/408,991 patent/US5596392A/en not_active Expired - Fee Related
- 1995-03-24 EP EP95301985A patent/EP0674244B1/en not_active Expired - Lifetime
- 1995-03-24 DE DE69517230T patent/DE69517230T2/en not_active Expired - Fee Related
- 1995-03-25 CN CN95103569.XA patent/CN1064143C/en not_active Expired - Fee Related
- 1995-03-25 KR KR1019950006460A patent/KR0167073B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07261558A (en) | 1995-10-13 |
| CN1115425A (en) | 1996-01-24 |
| EP0674244A2 (en) | 1995-09-27 |
| US5596392A (en) | 1997-01-21 |
| EP0674244B1 (en) | 2000-05-31 |
| DE69517230D1 (en) | 2000-07-06 |
| DE69517230T2 (en) | 2000-10-19 |
| EP0674244A3 (en) | 1996-12-27 |
| JP2960298B2 (en) | 1999-10-06 |
| KR0167073B1 (en) | 1999-03-20 |
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